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Let's get started.

You need to know what cookies are and their relationship with server-side sessions to understand this article.

We can ask the first question if you are clear on the difference between cookies and sessions.

I'm happy with how simple it is to use cookies and sessions in my web applications, and I've been using them to manage user authentication.

The new and more appropriate is to use JWT, according to an Apple developer.

He told me that JWT is the way to go to make native mobile apps work with authentication. He commented on the problems with cookies in the apps for the iPad and the Android device.

I've searched for information but haven't found anything that proves that cookies are superior to json web token I have not been able to find a significant difference between them and me, and they are recommended for use with native mobile applications.

I think it is possible to use Cookies in the development of the app.

What are the advantages of using JWT instead of Cookies for user verification in a mobile application?

As software developers, we tend to apply everything new we find.

If we suddenly find ourselves with a hammer that we have not seen before, we begin to see everything as a "nail", as an example. We need to apply everything new that we are learning.

Going back to the original question:

It is correct that both of them are used in the system.

Cookies are used in web applications to keep track of users.

They don't need to submit their credentials with every request.

A cookie's content is determined by a unique identifier. The server can find the corresponding session data for each user.

In the development of the APIs, it is more common to accept token so that the server decides whether or not to grant access to the person making the request.

This is because of something.

Cookie-based authentication is convenient for browsers, but beyond browsers, a token-based approach makes more sense, since token can be carried via parameters, or as part of the body of the cookies. The requests were made using the internet.

If the range of clients it can serve will increase, it will be more convenient if the API needs to be used outside of web browsers.

JWTs have an advantage over cookies because of the fact that their use is more common, but cookies are still possible in native mobile applications.

We can have more learning resources, more information about vulnerabilities, and more software development kits.

Next, we'll go over how cookies and sessions work, so we can highlight the differences later.

Cookie-based authentication has been used for a long time.

Cookie-based authentication presents a state.

After a user submits their credentials, the server logs data in order to remember that the user has been correctly identified. The state is the data recorded in the back end in correspondence with the session's id.

Session variables are stored on the server while a cookie is created for the client.

The flow that follows this system is similar.

Due to the rise of Single Page Applications, web APIs, and the Internet of Things, token-based authentication has gained popularity in recent years.

When we talk about using a token, we usually talk about using jwt.

JWTs have become the defacto standard. In the rest of the article, both JWTs and token will be used.

Stateless token-based authentication is possible.

The server doesn't keep information about which users are connected. Each request made to the server is accompanied by a token, and the server will verify the authenticity of the request based solely on the token.

The format for the token was defined by JWT. JWT doesn't require us to use any client-side data persistence mechanisms or have any rules for how the token should be transported.

The values of the token can be sent in the body of a POST request or as a query parameter.

Let's see how it works

After understanding how both approaches work, let's look at the advantages of token-based authentication.

The biggest advantage of using token and not cookies is the fact that they have stateless authentication.

It is not necessary to have a record of the token from the back end. Each token has its own data, which is needed to confirm their validity, as well as specific information of the user who has signed in.

The only job of the server is to sign token upon successful login and to verify that incoming token are valid.

When it comes to managing cookies across different domains, it gets tricky.

A token-based approach with CORS enabled makes it trivial to expose the APIs to different services.

If there is a valid token, the requests can be processed.

We will address the details in the Common Questions section about this.

We simply store the session identifier with a cookie-based approach.

The token allows us to save any type of data, as long as it is valid.

The JWT specification indicates that we can include different types of data, and that they can be saved as public and private data.

Depending on the context, we can choose to use a minimal number of claims, and save only the user ID and token expiration, or we can include additional claims, such as the user's email, who issued the token, the scopes and/or permissions that the user has, and so on.

The session search must be performed from the back end when using cookie-based authentication.

The round trip is likely to take longer than decoding a token in that case. We can decrease the number of lookups required to obtain and process the requested data because additional data can be stored in the token.

Users with the administrator role have access to see the last orders registered in our application, but only if they are in the same role.

Once the request is made, from the back end, it is necessary to make a query to verify that the session is valid, another search to access the user data and finally a third query to get the data.

JWT can be used to store the role of the user in the token. We need to make a single query to the database after the request is made and the token is validation.

In this section, we will look at some of the common questions and concerns that arise when it comes to token-based authentication.

The main topic is security, but we'll also look at how big token can be.

The JWT size.

The size of the JWTs is the biggest disadvantage of token-based authentication.

A session cookie is small compared to the smallest token.

If we load a token with many claims, it can be problematic.

The server must include the corresponding JWT in each request.

Where to keep the token?

We have the option to store the JWTs in certain places.

JWTs are usually stored in browsers' local storage, and this works well for most cases.

There are some drawbacks to storing the JWTs in local storage.

The maximum size of a cookie can be problematic if a token has multiple claims. Session storage is similar to local storage but is cleared when the user closes the browser.

There is protection for the XSS and XSRF.

Our users and server are always protected.

The most common concerns developers have when deciding whether or not to use token-based authentication are about security.

Two of the most common attacks that websites face are:

Cross site scripting attacks occur when an external entity can execute code on top of a website.

If a website presents inputs that are not properly validation, it is the most common attack.

If an attacker is able to execute Javascript code on your domain, you are vulnerable.

Many frameworks prevent arbitrary code execution.

If you are not using a framework that performs this validation, you can use a tool called Caja Compiler that was developed by Google.

It is recommended that you use a framework or a plug-in to solve the problem, rather than creating your own solution.

If you are using JWT with local storage, cross site request forgery attacks are not a problem. If you store the JWT in a cookie, you will need to protect it against the XSRF.

If you don't know what this concept is, you can watch a video that explains how the attacks work.

It is not very difficult to prevent XSRF attacks. It is important to be clear that a unique token is not a JWT.

Each time data is sent to the server, a hidden input field will contain a token and the server will check it to make sure it matches the token in the database.

It is a good idea to have a short expiration time for our token. Even if a token is compromised, it will become worthless. We may have a blacklist of compromised token to prevent them from being used. Changing the signing algorithm would require all users to log in again, and would invalidate all active token.

In case of a serious violation, this approach can be used.

The token is signed, but not ciphered.

A web token is made up of 3 parts.